Question

A particle is dropped from rest and another particle is thrown downward simultaneously with initial speed u, then

A.time after which their separation becomes h is h/u

B.their relative velocity is always u

C.their relative acceleration is zero

D.all of these

Answer 1

Answer:

A particle is dropped from rest and another particle is thrown downward simultaneously with initial speed u, then

A.time after which their separation becomes h is h/u

B.their relative velocity is always u

C.their relative acceleration is zero✔✔✔

D.all of these

Explanation:

when the particle is thrown downward or dropped from the rest the acceleration due to gravity is always in the downward direction so their relative acceleration is zero .

C is the answer

Answer 2

Answer:

C.

Explanation:

According to me it should be c. relative acc. is zero since both have same acceleration equal to acceleration due to gravity I. e 9.8 m/s^2 acting in the same or downward direction irrespective of their masses

(since g=GM/R^2-, where G is a constant and M is mass of earth and R is the radius of the earth )..

Their relative velocity cannot be u always as velocity keeps on increasing due to acceleration due to gravity

Hope this helps